Seed 2.1 Turbo and Kimi K3 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Seed 2.1 Turbo, from bytedance-seed, has a 262,144-token context window and is priced at $0.50/M tokens input, $2.50/M tokens output on OpenRouter.
Kimi K3, from moonshotai, has a 1,048,576-token context window and is priced at $2.80/M tokens input, $14/M tokens output on OpenRouter.